The BMW X6 M (E71), produced from 2009 to 2012, represents BMW’s foray into the high-performance Sports Activity Coupe (SAC) segment. This variant, equipped with the 4.4-liter V8 engine producing 555 horsepower and paired with the Steptronic automatic transmission, was the flagship model of the E71 X6 range. It aimed to combine the practicality of an SUV with the performance and handling characteristics of a sports car, targeting buyers seeking a unique and powerful luxury vehicle. The E71 generation X6 M was a relatively short-lived model, superseded by the F86 generation in 2014, but it established the M-badged X6 as a significant offering in BMW’s lineup.
Technical Specifications
| Brand | BMW |
| Model | X6 M |
| Generation | X6 M (E71) |
| Type (Engine) | 4.4 V8 (555 Hp) Steptronic |
| Start of production | 2009 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 4-5 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 19.3 l/100 km (12.2 US mpg, 14.6 UK mpg, 5.2 km/l) |
| Fuel consumption (economy) – extra urban | 10.8 l/100 km (21.8 US mpg, 26.2 UK mpg, 9.3 km/l) |
| Fuel consumption (economy) – combined | 13.9 l/100 km (16.9 US mpg, 20.3 UK mpg, 7.2 km/l) |
| CO2 emissions | 325 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 4.7 sec |
| Acceleration 0 – 62 mph | 4.7 sec |
| Acceleration 0 – 60 mph | 4.5 sec |
| Maximum speed | 250 km/h (155.34 mph), Electronically limited |
| Emission standard | Euro 5 |
| Weight-to-power ratio | 4.2 kg/Hp, 240.8 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 295 Nm/tonne |
| Power | 555 Hp @ 6000 rpm |
| Power per litre | 126.3 Hp/l |
| Torque | 680 Nm @ 1500-5650 rpm (501.54 lb.-ft. @ 1500-5650 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | S63B44 |
| Engine displacement | 4395 cm3 (268.2 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 89 mm (3.5 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 9.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Coolant | 17 l (17.96 US qt | 14.96 UK qt) |
| Kerb Weight | 2305 kg (5081.66 lbs.) |
| Max. weight | 2905 kg (6404.43 lbs.) |
| Max load | 600 kg (1322.77 lbs.) |
| Trunk (boot) space – minimum | 570 l (20.13 cu. ft.) |
| Trunk (boot) space – maximum | 1450 l (51.21 cu. ft.) |
| Fuel tank capacity | 85 l (22.45 US gal | 18.7 UK gal) |
| Permitted trailer load with brakes (8%) | 3000 kg (6613.87 lbs.) |
| Permitted trailer load with brakes (12%) | 3000 kg (6613.87 lbs.) |
| Length | 4876 mm (191.97 in.) |
| Width | 1983 mm (78.07 in.) |
| Width including mirrors | 2195 mm (86.42 in.) |
| Height | 1684 mm (66.3 in.) |
| Wheelbase | 2933 mm (115.47 in.) |
| Front track | 1660 mm (65.35 in.) |
| Rear (Back) track | 1672 mm (65.83 in.) |
| Front overhang | 858 mm (33.78 in.) |
| Rear overhang | 1086 mm (42.76 in.) |
| Minimum turning circle (turning diameter) | 12.8 m (41.99 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension, Air suspension |
| Front brakes | Ventilated discs, 395 mm |
| Rear brakes | Ventilated discs, 385 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | Front wheel tires: 275/40 R20 Rear wheel tires: 315/35 R20 |
| Wheel rims size | Front wheel rims: 10J x 20 Rear wheel rims: 11J x 20 |
Powertrain & Engine Architecture
The heart of the X6 M is the S63B44 engine, a 4.4-liter twin-turbocharged V8. This engine, also found in other high-performance BMW models of the era, utilizes direct fuel injection and a double-VANOS variable valve timing system. The twin-turbochargers are positioned within the V-angle of the engine, contributing to a more compact design and improved throttle response. The engine produces 555 horsepower at 6000 rpm and a substantial 680 Nm (501.54 lb-ft) of torque available from a low 1500 rpm all the way to 5650 rpm. The Steptronic automatic transmission is a six-speed unit with manual shift capabilities. It was specifically tuned for the X6 M to provide quick and precise gear changes, complementing the engine’s power delivery. The transmission features adaptive shift programs, adjusting to the driver’s style and road conditions.
Driving Characteristics
The X6 M’s driving experience is dominated by its powerful engine and sophisticated all-wheel-drive system, xDrive. Acceleration is brisk, with 0-60 mph times consistently around 4.5 seconds. The xDrive system is rear-biased, providing a more engaging driving experience than traditional all-wheel-drive setups. The automatic transmission, while smooth, can feel slightly less responsive than the dual-clutch transmissions found in some competitors. However, the broad torque curve of the V8 engine means that the X6 M feels strong and effortless in most driving situations. The air suspension contributes to a comfortable ride, but the vehicle’s weight (over 5000 lbs) is noticeable in corners. Compared to the standard X6 models, the M variant offers significantly improved performance and handling, but at the expense of fuel economy.
Equipment & Trim Levels
The X6 M came standard with a comprehensive list of features, befitting its flagship status. Interior appointments included sport seats upholstered in Merino leather, an M-specific steering wheel, and aluminum trim. Standard technology included BMW’s iDrive infotainment system, navigation, and a premium sound system. Optional extras included active steering, head-up display, and various customization options for interior materials and colors. The X6 M was positioned as the top-of-the-line X6, offering a more luxurious and performance-oriented experience than the xDrive35i or xDrive50i models.
Chassis & Braking
The X6 M features a reinforced chassis and a specially tuned suspension system to handle the increased power and performance. The front suspension utilizes a double-wishbone design, while the rear suspension employs an independent multi-link setup with air springs. Large ventilated disc brakes are fitted at all four corners, providing ample stopping power. Front brakes measure 395mm, while rear brakes are 385mm. The ABS (Anti-lock Braking System) is standard, along with other electronic stability control systems.
Market Reception & Comparison
The X6 M received generally positive reviews from automotive critics. It was praised for its powerful engine, engaging driving dynamics, and luxurious interior. However, some critics noted its high price and relatively poor fuel economy. Compared to the X6 xDrive50i, the M variant offered significantly more performance but came with a substantial price premium. The X6 M competed with other high-performance luxury SUVs, such as the Porsche Cayenne Turbo and the Mercedes-Benz ML63 AMG.
Legacy
The E71 X6 M, while a relatively short-lived model, established the X6 M as a desirable and capable performance SUV. The S63B44 engine proved to be a robust and reliable powerplant, and well-maintained examples continue to command strong prices in the used car market. The E71 generation laid the groundwork for the subsequent F86 and current G06 X6 M models, which have further refined the formula of combining SUV practicality with sports car performance. The E71 X6 M remains a unique and compelling option for enthusiasts seeking a high-performance luxury SUV with a distinctive design.
